Wrist watch casing



FIG. 1 is a bottom, front, perspective view of a wrist watch casing showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is a rear side view thereof.

The broken lines indicate environmental material and form no part of the design. 

The ornamental design for a wrist watch casing, as shown and described. 